가속수명시험에 의한 고속팬용 밀폐구조형 BLDC 모터의 열신뢰성 분석

Abstract

In this paper, thermal reliability of a closed type BLDC(Brushless DC) motor for high speed axial fan was analyzed by the accelerated life test. The closed type BLDC (Model No. MB1-8855-J01) motor was controlled by PCB module, which was composed of various electrical components. The failure of the closed type BLDC motor happened in PCB module due to high temperature. Failure mechanism of the closed type BLDC motor appears to be electrolyte dry out of capacitor. The accelerate life test was performed in temperature stress of 85℃ and 105℃, respectively. The failure data from the accelerated life test were analyzed and the life in each stress level was estimated with 960h and 261h. At last, both life expression according to operating temperature of PCB module and life of the closed type BLDC motor in normal condition(50℃) were suggested.